Android之ImageSwitcher

来源：互联网发布：板材套料软件编辑：程序博客网时间：2024/05/17 04:43

ImageSwitcher，把她理解成一个相框的话，里面放的是一张张相片(ImageView对象)，事实上，ImageSwitcher本身也是集成FrameLayout。

OK，直接上代码。

public class ImageSwitcherActivity extends Activity implements ViewFactory,OnClickListener{    /** Called when the activity is first created. */private static final int BUTTON_DWON_ID=0x123456; private static final int BUTTON_UP_ID=0x123457; private static final int SWITCHER_ID=0x123458; private int index=0; private ImageSwitcher switcher; int []images=new int[]{R.drawable.f,R.drawable.t,R.drawable.y};    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        //setContentView(R.layout.main);            switcher  =new ImageSwitcher(this);      //创建一个布局      LinearLayout layout=new LinearLayout(this);      setContentView(layout);      //加入组件      layout.addView(switcher);      switcher.setFactory(this);//设置工厂      switcher.setImageResource(images[index]);      //设置动画效果      switcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in)) ;      switcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out));           LinearLayout.LayoutParams params=new LinearLayout.LayoutParams(100,100);            //创建下一张按钮      Button nextBt=new Button(this);      nextBt.setText("下一张");      nextBt.setId(BUTTON_DWON_ID);      nextBt.setOnClickListener(this);//创建监听      layout.addView(nextBt, params);            //创建上一张按钮      Button preBt=new Button(this);      preBt.setText("上一张");      preBt.setId(BUTTON_UP_ID);      preBt.setOnClickListener(this);//创建监听       layout.addView(preBt, params);    }@Overridepublic View makeView() {// TODO Auto-generated method stubImageView imageView =new ImageView(this);imageView.setBackgroundColor(0xFF000000);imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);imageView.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.MATCH_PARENT,                 LayoutParams.MATCH_PARENT));return imageView;}@Overridepublic void onClick(View v) {// TODO Auto-generated method stubswitch (v.getId()) {case BUTTON_DWON_ID:index++;if(index>=images.length){index=0;}switcher.setImageResource(images[index]);break;case BUTTON_UP_ID:index--;if(index<0){index=images.length-1;}switcher.setImageResource(images[index]);break;default:break;}}}

简单解释下上述代码

要想让ImageSwitcher装载ImageView,就必须通过setFactory这个方法，并且重写ViewFactory的makeView方法